On an existing SharePoint 2010 site, we have a problem with first time visitors. The site is setup to be multilingual. The server installlation is English, there is an additional Dutch language pack installed. I have had several reports from Dutch users claiming the site displays dates in english format and currencies as dollars instead of euro's.
The weird thing is, an F5 refresh corrects this and the problem never occurs again, it seems untill the application pool is reset. For sites which aren't loaded in the current session / apppool and are then queried; the first request seems to end up in English, all other requests are properly handled in Dutch.
Weird problem, anyone has any ideas?