I am busy writing a language pack for the Dutch language. I am using PunTranslator for that. I started copying all contents of upload\lang\English to a new folder upload\lang\Dutch and started translation a few words. I than uploaded the folder Dutch to my website. Logged in as Administrator, I was able to modify the default language to Dutch. That didn't help me, so I changed the language in my profile to Dutch. That caused PunBB to never return anything else than <html><body></body></html> (sic).
1. I hit the Back button of my browser in an attempt to modify the setting back, which seemed to work, but didn't solve the problem.
2. I checked the mySQL table 'config' and found an entry 'o_default_lang' that was 'Dutch' and modified it to become 'English'. That didn't help.
3. I changed my user's profile setting through the table 'users', no result.
4. I uploaded all files from the dsitribution file punbb-1.2.1.zip again, it didn't help me.
Then, I uploaded to another folder, reinstalled using a different tabel prefix and a new forum was born that works well.
Finally, I cleaned up the cache folder, leaving only the file index.html, and all was OK!
Does anybody have a clue as to what has caused this? By the way, I was only setting up the forum, so no real harm is done here. I posted this mainly to notify this problem and the work-around. If anybody is interested, I will try to reproduce the problem and report.