Just tried the demo and I get pretty much the same thing. (The plugin window is sized differently, really tall and narrow, but it’s just as awkward.) For now, instead of removing the plugin to restore the window, just hit Podium’s Power button off and on; you don’t even need to close the plugin window.
Installed the demo today and I get the same behavior. I debugged the window size messages received from the plugin but I cannot make sense of it 😕
I tried changing the Podium code for handling plugin window sizing but got the same behavior. The first time the plugin window is opened it requests the host to sets its size to width=2 and height=26. Immediately after that comes a second request to set the window to its proper size. When the plugin editor has been closed and is reopened, only the first request for a size of 2×26 is sent. I hope you can live with the workaround.