Problem with windows size and title bar after installing WindowsBlinds

I have purchased WindowsBlinds today and I used the themes that are included in the program. Everything was going well and then I encountered a problem with an old Windows program called Family Tree Maker 2006. Initially it was working well, then I added the Classic theme from WinCustomise and switched it back to Acrylic 7 theme. I then launched Family Tree Maker 2006 and it seemed to move on the screen as it opened and I have lost the titlebar and the toolbar. The strange thing is that this program had been working OK with WindowsBlinds just before this happened.

I also use Classic Shell on my PC with a dual monitor setup. The only way I can get my program to open correctly is to revert to the default Windows 10 theme.

I have tried to reduce the size of the window whilst in the Windows default theme and then add a WindowsBlinds theme once more. Whilst the window doesn't get resized/maximized when I do this, there are no icons to minimize/maximize/close the program.

I really would like to use WindowsBlinds but I use the FTM 2006 program a lot. Do you have any ideas how I can fix this please. I am not technical, I'm afraid.