Originally Posted by
Trenloe
The issue here is that there was an update to the Forge product 4 days ago which fixes the blank window issue, but the dev changed the extension filename from CreatureLab-v1.10.0.ext to CreatureLab-v1.11.0.ext - which results in the old extension remaining on FG, and existing campaigns set to use this extension will still use the old extension. Devs shouldn't change the filename when updating extensions!
In the long run the extension dev should pick a filename and stick to it when updating the Forge product.
In the short term, users should delete all old versions of CreatureLab from their <FG app data>\extensions directory, keeping CreatureLab-v1.11.0.ext When you load up your campaign, check the version reported in chat - it should show: CreatureLab v1.11.0 (GPL v3)