Sorry, folks. My computer is too important for me to fry it running Rosetta.

Given that there are hundreds of thousands of computer systems that are capable of running at 100% load for days & weeks (and months & years) on end without overheating, the other option would be to fix the problem with your CPU cooling.
Even at Milkyway your system misses the deadline 75% of the time, so there's a good chance your CPU is thermally throttling even there- as 12 days is plenty of time to return work, here at Rosetta it's 3 days.

I even removed and reapplied thermal paste.

What were the CPU temperatures before & after re-doing the CPU heatsink, at idle & at full load? (i'd suggest Cinebench 2024 using the multicore test using all cores & threads, to load test it, with BOINC processing suspended).
If you used more than the slightest smear of paste, then there is your problem. Heatsink paste is meant to fill the air gaps between the heatsink & the CPU, and not come between the metal of the CPU & the metal of the heatsink- otherwise it acts as heat insulator, not a conductor (it's heat conductivity is much greater than that of air, but way, way, way less than that of metal to metal (i would also hope that the heatsink doesn't still have it's protective plastic cover on it...)).

28 tasks with validate error...great....but i suppose thats just the way it goes with a beta.

But I can guarantee you I did NOT change it to stop work being issued

The Project will do it if the system produces errors.
However, what errors & how many are required to trigger that happening are unknown.

For what its worth, I have managed to install fedora 36 lxde and fedora 32 along with vbox 6.1.

It seems to be working ok sofar. This combination has done a good number of lhc & cosmology vbox w/u's .

Not sure why rosetta only uses half the number of cpu's available. Does it use 2 cpu's/vbox job?.

Anyway it seems fedora 36 does work.

I installed the latest Boinc release (7.20.2-1.fc36) for this Fedora and started getting errors.
I DOWNGRADED back to the previous Boinc release (7.16.11-6.fc35) and it seems to work fine again so far.

It is because of the security changes in BOINC 7.18.1 and later.
Some projects have adapted to it, but not the pythons.
https://quchempedia.univ-angers.fr/athome/forum_thread.php?id=166

Rosetta python work has a nasty habit of blocking work to a computer that has had a few errors or whatever takes its fancy
Go to the details for your computers page in your account at rosetta and scrole down to the bottom of those pages
You will see a blue/red button labled `skip` or `allow` ,
If you see the word `allow` , click it to get work again , coz U got blocked for some reason
Bin there dun that its a pain , but when python first started there was no button to restart work flow
or it could be something else , worth a try .

Is it possible to limit the number that run at once? on my machine with 32gb ram it runs 11 at a time maxing out the ram, the issue is though that its not even half using my CPU (5950x) which causes a few cores to run really fast and the heat to jump up causing the fans to spin up.
I don't want to stop doing them but limiting to like 4 at any one time would be great.

No news??

If they were to share the tools used to create the virtualbox, would anyone here be able to convert it to a non-VB task? I.e. do the work for them and send the method back? I expect they are all contracted to do specific work based on funding etc which this would fall outside of.

BOINCTasks shows whether a task is using CPU time or not so you can see what to abort.
https://efmer.com/boinctasks/download-boinctasks/

>>> LARGE part of clients/volunteers runs Windows

Certainly. Let us, however, consider the purpose. We are trying to help them. It is up to them to decide if Linux users are sufficient in number to acheive the result they require. It is already mentioned in this thread, that the amount of work from the project is a lot less than it used to be. They will, however, pick up on the fact that Windows users are seeing crashed work, and stop issuing it to these people, that, obviously, includes me.

[I think the XML works find for Rosetta. There have been some problems in the past with the projects and options, but I think Rosetta is fine.

It isn't the .xml file itself that is the problem, but the "<project_max_concurrent>" tag (also the "<max_concurrent>" tag).
Under certain conditions, BOINC thinks it needs to download more work.

You can check it with a test case. https://github.com/BOINC/boinc/issues/4322
It caused me problems here the last time I used it a year or two ago, and no one has said it has been fixed yet that I have seen.

The github issue regarding Step 1 has recently been added to the next BOINC client milestone.
That's a good sign.

Great!! Maybe other projects can use this feature...

It has not but it is not as simple as use this tag and you will be flooded. I’ve used exactly that app_config file on all my projects for several years and never had a problem.

You can investigate it in more detail, and maybe avoid the problem, or not, as the case may be.
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5726&postid=45384#45384

You have the the molecular chemistry or whatever department at the university, then the institute, then it seems Baker Lab falls under that umbrella and splits out into robetta, rosetta and foldit, A lot of names that are just sub units of something. It's almost like a circus juggling act.

I understand you're tired of this situation (like me), but i think you're a little bit impolite.
This project is not "a circus", it's science and every kind of help, from simply cpu time to Foldit volunteers, is done with a purpose.

Thanks for the explanations. My stats change, although I never see any work on that computer, so I guess it's getting them at night. I'm running Linux so don't know if there's VirtualBox for that setup. I'll just leave it alone.

Rosetta 4.20 tasks are not always available. they send out a few days. This may be the problem. If you install virtualbox, you will receive some python tasks and those are always available.

I had a look at the "details" page for the windows pc`s and the "application details" recons that one has completed 1534 python tasks the other 8 ,
have a check at the bottom of each windows pc details page to see what the [blue+red] skip/allow button is showing ,
if you see the word "allow" , click it ,
The skip/allow button setting is a silent killer of downloads .
worth a try .