Yes, I was talking about this feature last days. HostMonitor pauses monitoring because "sees" too many started threads, it wants to wait until test probes finish before starting new test probes.So there is an internal check within Hostmonitor to count its threads ?
And it has a limit ?
We changed some code and make more strict checks in version 8.77 so you should have the same problem with version 8.86, this problem should not be related to 9.00 update

Anyway, if I am right, then the following update should help:
http://www.ks-soft.net/download/hm932d.zip
- unzip the file,
- replace hostmon.exe module,
- add IgnoreTotalThreads1=1 line into [Misc] section of hostmon.ini file and start HostMonitor.
Regards
Alex