Sub-tab is blank
The new WME version has impacted scripts/tabs that have multiple sub-tabs. If the tab has multiple sub-tabs, it will open and be blank. If you open another sub-tab then re-open the first sub-tab, it will show the content. But this will repeat every time. Here is a screen capture of the behavior:
https://www.dropbox.com/s/9w48tjktx8yvti6/blank.gif?dl=0
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G_W1Z
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