Unable to use font: no glyphs present

Hi,

It seems that since today, when I click on the Time Machine button to browse the backups, I get the following errors in the in the logs:

23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] Serious problems were found in font data while activating it.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] You may encounter drawing or printing problems.
23.01.08 18:56:20 quicklookd[5278] Unable to use font: no glyphs present.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] Serious problems were found in font data while activating it.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] You may encounter drawing or printing problems.
23.01.08 18:56:20 quicklookd[5278] Unable to use font: no glyphs present.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] Serious problems were found in font data while activating it.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] You may encounter drawing or printing problems.
23.01.08 18:56:20 quicklookd[5278] Unable to use font: no glyphs present.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] Serious problems were found in font data while activating it.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] You may encounter drawing or printing problems.
23.01.08 18:56:20 quicklookd[5278] Unable to use font: no glyphs present.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] Serious problems were found in font data while activating it.
23.01.08 18:56:20 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[95] You may encounter drawing or printing problems.

Does anyone have an idea why I get those errors ?

Thanks