Simultaneous image acquisition

Yesterday, I discovered a possible bug regarding the Plate solving function of SGP.
During a continuous session of frames acquisitions with the Frame and focus tool I was upset minded and initiated a Center Now function. The function initiated without hesitation and the table for Plate Solving appeared and in fact the was a progress bar.
Obviously not image was taken for plate solving since the Frame and Focus function was already taking 2 sec frames continuously. In addition, the Plate solving frame has not [X] button to cancel it, while at the same time it doesnt allow u to press any button besides those place in the frame. So I was stuck. Fortunately, at some point it just closed by itself.
Clearly, the must be some way to prevent a second initiation of a imaging while one is already happening.

Thanks. I have added code to protect users from accidentally trying to do this.