Maintained spell window broken?

[Kellindril]

With GU35 I can no longer adjust the width of maintained spell window to be wide enough for two columns. I can make it narrower, but it won't let me make it wider. What do I need to do to be able to fix this? I have version 3.4 installed and I have tried using older versions of the maintained spell window but that doesn't seem to make any difference. Any help is appreciated.