It seems that my problem is solved by deleting the cache and cockies. Ebay is now looking like before - thanks for your hints!

'It looks that way even with Turbo disabled?'

Yes, no matter if Opera Turbo is enabled or disabled.

Well i'm not shure how to post pictures here, so i will give you the links to them.

What should look like this:

http://www.hunold.org/pics/ebay_1.jpg

is looking like this in Opera 43:

http://www.hunold.org/pics/ebay_2.jpg

More information:

Version: 43.0.2442.806 (PGO) - Opera ist auf dem neuesten Stand

Update-Stream: Stable

Betriebssystem: Windows 10 64-bit (WoW64)

Same problem here. The "normal" ebay sites are okay, but choosing "my ebay" causes display issues.