Hey guys!
After installing V3 on my ESP8266, I've too had the problem that a lot of functions in V3 of the software did not work.
I've had a roommate who studies computer science troubleshoot it and he discovered that there were some typos in the javascript (line 587 for example, "HEX" instead of "HEXA").
This typo concerned the conversion of colors from HSVA to HEX.
We've managed to fix the code (I as well edited the ESP-hosted web page a bit to make it darker) , and I got the V3 software to work again! (speed, brightness, save as default, color picker).
With this we can finally have more programs AND tile mode!!
I've attached my full .data folder, with which you can replace your old one.
The changed web-page looks like this:

If you don't want the darker looking page you can just replace the .js-files.
The .ino files remain unchanged.
Hope someone finds use in this, cheers!