Problems with upload

I am running a fullt upgraded Debain "testing" system, and I have a smaller problem with uploading files. I use my installation to develop PHP applications, and a part of this making file upload scripts. A have a basic form, in which i can upload a file, the header information gets passed fine into PHP (name, size, mime-type, temporary placement in system), but the file is NOT placed into the temporary location which by default is /tmp. I have tried using other temporary locations, but that did not work either. I have also tried to recompile both apache and php, so I was not using the stadard packages, that did not work either. The settings within php allow fileupload, so the problem should not be there. Has anybody else had similar problems???? /Martin