I vague recall reports of this happening - as an experiment, try rolling back one patch & see if regenerating the help seems to act the same way or not.
How are you testing? From your local hard drive or from a server?
I have that version of RoboHelp installed and I just tested using that method and it seems to work fine on my own computer.
oops. I was just re-reading and noticed that you mentioned the insertion of the ? as part of the path. I didn't test that way. My test omitted the ?. But I just now tested by inserting the question mark and it seems to work fine that way as well. Odd
We're testing from our QA environment so the files are coming from the server.
Linking to the help files like this: