I have a list with customized versions of NewForm.aspx, EditForm.aspx and DispForm.aspx. The list has been up for more than a year and contains about 1700 rows.
Earlier I made a minor change to DispForm.aspx and it seems like the list lost it's association with DispForm.aspx as the default view page. Links from all views now point to "site/?ID=123" instead of "site/SubSite/List/DispForm.aspx?ID=123".
I've used Sharepoint Designer to re-apply the settings for which files are associated with actions but it doesn't seem to work.
The site is running on multiple servers and I suspect that changes might not apply until a service restart (this has been the case for some other changes in the past), but hopefully someone here has some ideas.
Unfortunately, I have only remote access through SPD and no privileges outside the specific site.
Update: It seems my google-fu was weak earlier but I believe I found a possible solution here.