Unable to move windows using VNC

Hi, we are developing a project in which we are using several touch panels, this panels have an Atom Processor, 4gb of ram and they are running a custom extremely light Linux distro.
We have tried to run the clients on these machines, however they are too slow opening windows, they cant be considered good enought to be ready for production.
So we have been trying to run the clients using the Mobile Module, we connect the touch panels via VNC using the functionality Ignition offers with the Mobile Module. The performance is pretty good, enought for our requirements. However, we have found that we cant move any popup window, not even the diagnostic window.

I guess this is disabled internally and Im wondering if there is a workaround for this problem. Any suggestions?

Thank you!