That root cause qualifies as a Tuesday's tip. Thanks
Also this thread is another lesson in how to read error messages:
"Ambiguous name detected. :~ "
When you have a project open there is a temporary file just like with MS Office docs.
The file name has that [size=5]
~[size].
Many of the users of the schedulers are aware of that.
When you have a stand alone scheduler you you close it without closing the project you get similar error when you try to open the next time. Just delete the temporary file and you can open the project.
Martti K.