When I build my document, several weird characters appear. Take a look at the picture below:

The most strange thing, is that exactly the same tex file compiles fine on an other computer of mine. I am using TexLive 2011, the same version as on my other computer. A fresh install of TexLive did not solve the problem.
Does any one have a clue about what could be causing this problem? I suspect there is something wrong with my TexLive distribution, not the document. (It also happens for all of my documents, but that could be because they use mostly the same packages (among others fontspec, xltxtra, polyglossia, url and hyperref).
xdvidpfmxthe other and this results in glyph confusion. Put\XeTeXtracingfonts=1in your document and compile on the command line withxelatex --output-driver="xdvipdfmx -vv". Then compare the font pathes in the log with the output ofxdvipdfmx. – Ulrike Fischer May 21 '12 at 9:08-vvand naturally you should add the name of document at the end. – Ulrike Fischer May 21 '12 at 11:20