Please post a screenshot illustrating the problem. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

"The page in Inbox or Drafts is blank white in the email section but blue bars appear when moving the cursor over it...."

It looks like your mail files are corrupted. First of all create a backup of your Thunderbird profile folder. https://support.mozilla.org/kb/profiles-tb#w_backing-up-a-profile

Then try to rebuild the index file of the troubled folder. Right-click the folder - Properties - Repair Folder

Note: depending on the corruption this may erase messages from the affected folder which cannot be recovered anymore. In that case you'd need to restore them from a recent backup done prior to the corruption.

Corruption is often caused by anti-virus software messing with Thunderbird mail files. It is therefore recommended to create an exception for the Thunderbird profile folder, so that the real-time scanner won't attempt to scan the profile with your mail.

For more information on the profile location see http://kb.mozillazine.org/Profile_folder_-_Thunderbird

Also see http://kb.mozillazine.org/Keep_it_working_-_Thunderbird

I didn't have a chance to try that yet... but the Inbox has suddenly become visible + functional again... only the Drafts page is still opaque...