Ps won't merge layers.

[#1]

I'm having loads of trouble with Photoshop lately. First an errror message when saving (work around by disabling all layers except background before saving) I then reset my preferentces, which seemed to solve this issue. Now I cannot merge layers. I'm getting a similar system error message. Anyone know a way to fix this? I'm getting pretty fed up, thinking of cancelling my subscription. Thanks for any help

[#2]

I'm having loads of trouble with Photoshop lately. First an errror message when saving (work around by disabling all layers except background before saving) I then reset my preferentces, which seemed to solve this issue. Now I cannot merge layers. I'm getting a similar system error message. Anyone know a way to fix this? I'm getting pretty fed up, thinking of cancelling my subscription. Thanks for any help

[#3]

I am having the same problem.