Could it be that a POST request is limited to size? I have a large procedure I want to cache the output from. Basically I want to store a lare html-table in cache because of
I just ran into this problem myself and found that since PHP 5.3.9 there is a new setting available which restricts the total number of post variables (not just the size).
max_input_vars = 1000
This may have been the same issue you were running into if you were using a nightly or release candidate version of PHP at the time.