I have a question - what exact 1.7 version did you apply upgrade from, and how did you do the upgrade?
I ask because the upgrades are diff/patches, they have to be done sequentially
- so if it was 1.7.4 originally -
A. - upgrade to 1.7.7 using that upgrade- xampp-linux-upgrade-1.7.4-1.7.7.tar.gz
B. - then upgrade to 1.8.0 - xampp-linux-upgrade-1.7.7-1.8.0.tar.gz