This
discussion[
^] seems similar to problem. Unfortunately is does not give a definite solution, but they suggest the problem might be that the form is non modal.
The last
message[
^] is:
HarvestR wrote:
As my main form is the first loaded, it may be not modal.
I'll try to set the background form as first form of the project, then make it open the main frame modal.
Thanks for the idea, I'll test this
Perhaps you might try a similar approach and see if it solve your problem.