@Jay (HyperA) @Martin (Martino88), your difficulties have nothing to do with the original issue described here which is now resolved and closed. If you need help, open a new issue at the addon homepage and please don't bother the Blender team here. Also it seems that both of you haven't read the addon documentation as the basemap operator is a modal operator and you just need to press echap to exit it.

I can confirm lot of people still encounter this issue with 2.81

Thanks for the feeback.

Can we just rename the problem? It seems there is still an issue with auto draw method on linux with opensource ATI driver

Setting window draw method to triple buffer solve the issue. The problem also appears on 2.77 when draw method is not set to triple buffer, so its not relative to 2.78 release.

Seems the problem only occurs on Linux, anyone can confirm ?

Same at line 149 :

Not directly linked but I've also noticed that in Blender 2.74 and prior with a background image size set to 1 the image width represents 2 units but since v2.75 a size of 1 gives an image width of 1 units. I think it's better but can't find any information about this change and it also broke files or addons.