I am new to Plogger, and like the script, but: I also have this problem. I found several posts about the problem, and tried all hints (like the ini_set settings) but to no avail. I cannot change the php.ini on my server.
Please, is there anyone who can help us with this annoying problem?
I have checked my server config and found out that it is running on low memory. Or that's what I think. Since I am not posting hi-res images anyway, I lowered the ini_set memory_limit setting to 100K. And: now it works! I am now trying to raise this setting, to find out at what memory limit setting it breaks.