This sounds like you might be using VE? Can you give more detail please?

Hi @Lieutenant_Jade, thanks for taking the time to report this!
Unfortunately this report lacks some information. If you have time and can still reproduce the problem, please add a more useful and complete description to this report. Steps to reproduce should allow another person to follow those steps (leaving no room for interpretation) and see the same results. Thank you for your help!

The infobox is scripted to be portable with 65 lines.

Google chrome Version 46.0.2490.86 m Windows 10

Do you know where i can for wikia wiki

@Lieutenant_Jade: Please see http://community.wikia.com/wiki/Help:How_to_report_bugs

Same on cs.wp in the themplate Infobox - sídlo from today. Yesterday it worked, today, I cannot edit these templates. There was no change since yesterday in articles. Example is e.g.: https://cs.wikipedia.org/wiki/K%C3%A1men_%28K%C5%99enice%29

I recently upgrated to FF 43, but I dont remember when. The problem is registered also in Google Chrome, log in/log out does not influence it, the problem persist. I attach a screenshot.

Doesn't it let you edit the template when you double click, or when you select and click Enter?