Customer is seeing this error error spamming his smp logs:
The handler 'PersistentSettings' is failed to process request.
System.NullReferenceException: Object reference not set to an instance of an object.
w3wp.exe process throws this error into the smp log.
The handler 'PersistentSettings' is failed to process request. System.NullReferenceException: Object reference not set to an instance of an object.
Known issue. Null reference
This issue has been fixed with the ITMS 7.6 HF7 release.
A pointfix is available for those with ITMS 7.5 SP1 HF5. See attachment "3867054_TS_7.5_SP1_HF5.7z".
Note that this only fixes one cause of the null reference. This is compatible with SMP 7.5 SP1 HF5.