Unable to click or select in Sandboxie...

Hello, I have been looking for a solution to a problem which recently started to occur with Sandboxie.  I use multiple sandboxes to conduct work throughout the day.  They run simultaneously and I have never had a problem for the year I have been using Sandboxie until about one week ago.  The problem: I can only have one sandbox open at a time which allows me to click and select applications.  While I can open other sandboxes, I am not able to click on anything with a mouse or with my trackpad.  So, for example, SandboxA will run an application without a problem.  I then open SandboxB and I am then unable to select any feature (and it does not matter which application as the problem is with all applications and any menu features in Sandboxie itself).

Is this a known issue with Sandbox now, or is there some remedy to the problem?

Thanks...