Many people have margin problems when they try to upload pdf files to PaperPlaza and other such sites for conference contributions. The most common reason for this is that the package psfrag puts invisible contents in the margin. To get rid of this problem do as follows:

• Create a PS file, i.e. use dvips, not dvipdf.

• Edit this PS file in any text editor. Search for the string /Hide PSfrag. Remove everything between /Hide PSfrag and /Unhide PSfrag, inclusive. Either remove the text completely or comment with %. Repeat in the entire file.

• Convert the file to PDF with ps2pdf. Check that the result is in the proper format, i.e. A4 or Letter according to the conference requirements.

• Upload again. Now it should work.