Yes...but saying you were to blame would be less 'friendly'...though in reality Thunderbird didn't install itself without your help....so....
Solution would be to revert to a version of T'bird that DID behave nice with Windowblinds.
I recall reverting from IE 10 to IE 9 just so a Microsoft game would still work without CTD.
....and the same with IE 11.
I didn't blame the game....I blamed the updating to the OS that I did...