LS version 3.14.5

I tried several times to create new test surveys:

When I first tried to add 72 attributes, I got an internal server error: (Sorry, but in German)

500: Interner Serverfehler
CDbCommand konnte das SQL-Statement nicht ausführen: SQLSTATE[42000]: Syntax error or access violation: 1118 Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs

I'll try to translate:
500: Internal Server Error
CDbCommand failed executing SQL-Satement: SQLSTATE[42000]: ...

After it failed, I tried to add just a few attributes (9) to the same survey, wich was not possible anymore. So I had to delete the survey and try with a new one:

After a few tests I found out, that once I had tried to add too much attributes, it was not possible anymore, to add any attributes, - even if there were none yet. (Same error as above.)

I found out, that when I add 10 attributes a time, I am able to add ten and ten and ten ... until I have 60 attributes. When I then try to add another 10 I again receive the above error.