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That was it!  So simple!  Thank you!

You’re welcome.

Hello guys,

I have this error when trying to upload an image, smaller than the maximum allowed size:

Error 999 – Unknown server error (check image size – may be exhausting memory)

What should we do? Thank you

Well that literally means what it says. Your server has returned with an error condition but has given us no clue as to what the problem was. The one possibility mentioned is that the file is just too big so let’s start there. How big is it?

not too big. it`s 700k and limit is somewhere to 1.2 mb … you think the php`s memory_limit may be causing this?

I didn’t write this (and much of the code is third party of course – plupload coming from Moxie – the authors of tinyMCE) but I doubt somehow it is php memory as that would most probably have errored independently. Your server is failing the operation.

The most obvious reason is size – either blowing the maximum POST variable size or upload size allowed – but there are also going to be others. For example – if the php ‘tmp’ folder is missing or is full and needs emptying as the ‘tmp’ folder is required for any file upload operation. That is worth a check and I would also run it past your hosting support.

The apache logs may offer a clue although I can’t swear to this.

Have you tried with something small? Might be worth a test and might provide extra information to ask your host about.