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When I try to start QGIS 1.8.0 I get the error message "Can't find procedure start address TIFFMergerFieldInfo in libtiff.dll" and the program won't start. I have downloaded and reinstalled QGIS several times, but it does not help. What to do? Any suggestions? I have noticed that this problem is not unique to me, but I have not found a remedy.

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It's not a QGIS problem. That's why reinstalling doesn't change anything. It's a problem in your system caused by other applications which installed their incompatible DLLs in windows system folders. – underdark Mar 12 '13 at 20:28

The work-around to this issue is to rename libtiff.dll in your windows\system32 folder, then restart QGIS. You can either:

  • rename the file to something like libtiff.dll.bak, OR
  • rename the file (as above) then copy libtiff.dll from your QGIS install folder to windows\system32

The following links identified this work-around.

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