Thank you for your prompt reply.
My operating system is Windows 7 Home Premium, 64-bit, Service Pack 1.
This behavior does appear to happen every time.
Once, I started the program, clicked File then, while moving the mouse pointer down to open my last file, when the cursor reached approx Save As (TLServer 3), the File Dialog (window) closed. I tried several times but the same thing kept happening. I closed the program, restarted, no problems. Strange.
The main symptom is, for example, you click on an contact to, say, change it's name. The contact highlights yellow as it should but then for no apparent reason the screen will scroll quickly vertically, the highlight is reset and the circuit pointer location is lost.
Personally, I fail to see how it could be a problem with TL V7 but I do not know.
I am using a Logitech wireless mouse, will try a different mouse.
I am running multiple monitors with a reputable third party software package to manage the monitors.
I have not yet tried a system reset. Will try tonight.
This is a desktop PC.
Keeping you informed.
Gavin