Windows 10 Pro, FlexSim 18.2.2 x64, installed to C:\Program Files\FlexSim 2018 Update 2\. New default installation from the MSI file. When I run FlexSim as an ordinary domain user, after opening User Manual there is an exception in the System Console:
exception: Could not write html file
Manuals are not displayed at all (there is an index, but the pages are blank).
FlexSim 18.0.8 doesn't have this problem.
EDIT: I might have found how to reproduce this. I have two accounts on the same machine. One is a domain user, the other is a local account. After I ran FlexSim under a local account, I started seeing this error under the domain account. Removing the contents of the ProgramData directory fixes this issue.