I have a Planewave scope with Planewave mount. When not using ACP, everything is fine in terms of connection, control and anything else I want to do with the scope during the night.

However, when I first connect to STI telescope control software via ACP I get an error:

"Cannot connect to SciTechExe.Exe: Remote Scope Invalid"

What is kind of strange is that the SciTech window seems to come up anyway. But its intermittent in how it works. That is, sometimes when I've put in a request for observing via the web interface it has worked, but other times, nothing. Lately, it seems to be more consistently nothing, which might suggest other problems besides this warning message. However, if I try to operate the scope outside of ACP, all is still fine.

Any suggestions on what I should be investigating?