add new items not working

[aoifa]

hi all, have tried new themes, repurpose and bender purple, but cannot add new items in these - removed all plug-ins like cookies , payment and recaptcha - still no go
change it to modern theme and all is working just fine....
any help available ?

[frosticek]

@aoifa
Check your error log if you can find some useful info about your problem and add it here