Embarrassing, a Spanish colleague had been on the server and changed all the setting!

We've reproduced this and implemented a fix- we'll have v3.3.3 available today to resolve this issue. Thanks for the bug report!

I installed ProGet 3.1.2 today and the errors I experienced with 3.1.1 are gone. Thanks for the quick turn-around on the fix, you guys are great. Riko

We will be adding a few fixes to help with retrying after indexing issues in the next maintenance release, as well as some more logging to figure out what is going wrong in these cases. Long term, we will also be redoing a lot of the indexing logic to eliminate these types of problems (but that probably will happen in a minor/major release.)

Hi, Thanks for the bug report; this will be addressed in the next release of ProGet, which is due in just a few days!

Sorry about that - there was a bug with that action in BuildMaster versions pre-v3.6.5 (specifically BM-1137). If you upgrade to the newest version of BuildMaster the "Set File Attributes" action with your masks will function as intended.