The stats do not update at all since the 11th of August:

Index of /usr/stats
[ICO] Name Last modified Size Description
[PARENTDIR] Parent Directory -
[ ] badge_team.gz 2020-08-11 07:30 407
[ ] badge_user.gz 2020-08-11 07:30 1.0K
[ ] db_dump.xml 2020-08-11 07:30 1.1K
[ ] host.gz 2020-08-11 07:30 1.7M
[ ] host_deleted.gz 2020-08-11 07:30 82
[ ] tables.xml 2020-08-11 07:30 2.6K
[ ] team.gz 2020-08-11 07:30 22K
[ ] team_work.gz 2020-08-11 07:30 2.8K
[ ] user.gz 2020-08-11 07:30 14K
[ ] user_deleted.gz 2020-08-11 07:30 81
[ ] user_work.gz 2020-08-11 07:30 8.2K

At both places only the Top 5% badge is shown, but the beta badge is missing.

Point me to your 5% badge here then....you are right about the 5% badge at FreeDC, it was too small for me to see here.

On top of the site there is a box 'Top 5% RAC' containing three projects: GoofyxGrid nci, wanless and iThena.

The main problem is, the beta badge isn't shown at the iThena site.

At both places only the Top 5% badge is shown, but the beta badge is missing.

The good news is that not only our total credit scores can be seen on the various stats sites,
but that our subproject scores can now also be seen at FreeDC.

The bad news is that though our total scores do update every day, the subpoject scores remain the same every day
In the case of iThena PERF this could be caused by lack of new WUs, but iThena CNode should show changes, just like the total scores.
It seems that either the export file user_work.gz may not be producing the right figures, or FreeDC has an error -but they only report the content of the export stats directories of all BOINC projects, and no others are at fault.

My own scores:
iThena CNode credit 12,304.26111667 total, 476.28751356 average (78767 tasks)
iThena PERF credit 36,122.00000000 total, 370.45678446 average (18062 tasks)

FreeDC
iThena CNode 10,410
iThena PERF 36,122

Sorry for the wait, was very busy. Sometimes it's really hard these days to put enough time into the hobbies... ;-)
Although, I only made the letters a bit bigger now to see if you're okay with that (examples with different colors and another font as before):


And here are the same with a more "modern" font:

Hi Rysiu
Just to inform you all completed tasks are stuck

This does not seem normal as all of my other tasks have run-times around 45 minutes. There is nothing in the stderr to give me a clue why they get stuck.

The most recent one that I aborted not long ago: Task 3698464 had a Run time of 3 hours 51 min 40 sec until I aborted it.

The longest running Task 3619082 had Run time of 2 days 12 hours 10 min 18 sec before I noticed it and aborted it.

Below are 4 tasks that over the last several days that have ran 1+ hours: until I manually aborted them:

3698464	3698571	5045	24 Apr 2020, 0:54:10 UTC	24 Apr 2020, 4:46:28 UTC	Aborted	13,900.97	1.14	---	iThena PERF v1.02 
windows_intelx86
3649883	3649990	5045	21 Apr 2020, 19:22:45 UTC	22 Apr 2020, 6:48:50 UTC	Aborted	35,474.80	2.06	---	iThena PERF v1.02 
windows_intelx86
3622959	3623066	5041	18 Apr 2020, 11:07:37 UTC	19 Apr 2020, 15:32:17 UTC	Aborted	102,265.06	1.19	---	iThena PERF v1.02 
windows_intelx86
3619082	3619189	5045	18 Apr 2020, 0:22:36 UTC	20 Apr 2020, 12:33:30 UTC	Aborted	216,618.79	0.12	---	iThena PERF v1.02 
windows_intelx86

Maybe raspian buster is the problem?

Yes. The problem occurred after the database migration. But the database works...

There's probably a bug somewhere...

I'm trying to find the problem.

There may be a discrepancy between the database schema version and the server version
You can try to find and run the database update script from the upgrade kit, look for the part where all these bells and whistles with the new policy are added

There has been no stats export since February 8th, 2020

Perhaps any connection with the project prefs, where I can't safe my permission to export stats?

add something like military ranks? For example, some star/s? ;)

Yeah, good idea. This way it won't be fixed to numbers and you can vary it later when you introduce the "real" credits.