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I had stopped the server using the Start/Stop server dialog. I attempted to execute a HTML file. Got an exception in the server log file (see attachement) , and I also briefly (not long enough to read it) saw a cryptic message in red on the server dialog. Executing the same file again appears to work.
Created attachment 14360 [details] Exception from context log
Created attachment 14361 [details] Exception from server log
Seems to be fixed now.
Verified.