Let me describe a typical sequence that can (seemly at random) induce the behavior.
I have a 24 inch monitor and I keep TMG in the right half.
I will generate a report and keep the preview in the lower left side.
I then typically use a browser in the left half to obtain some data (so I can see TMG and the browser at the same time).
At some point in this process I need to view the report again so I click on the icon in the task bar to bring it to the front.
Sometimes it's necessary to move the report window a bit or scoll down so I can read what is behind it etc.
I typically then click in the body of the report if I need scroll down or click and drag on the upper 'handle' area (don't know what that region is called but you know what I mean) if I want to move the window.
On some occasions(about half the time), the report window expands to fill the screen as if I clicked on the 'maximize' region of that upper 'handle' area when I either click on the handle or body area.
I have not been able to correlate this behavior with any specific action(s) I've taken with the browser, downloading files etc.
I just tried it couple of times while generating this post and the report window has behaved normally.
If this has not come up before it seems VERY unlikely that the TMG software alone causes this but I thought I'd inquire in case someone else has run across this annoyance and found the root cause.
I am working with the software now and I will try to note my actions so the next few times I experience the behavior I may have some better idea of what specific actions correlate with the unexpected maximize.
Thanks for the help.