Apologies if this has already been asked and answered elsewhere.
We have recently upgraded to Windows 7, and since we did, some users have started experiencing problems with their IE plugin. They can load the AccessPoint menu with no problems, but when they click on a document it opens with Ajax rather than the IE plug-in. The plug-in is definitely installed, and it has definitely been set as the Preferred Client in the Profile menu.
It seems that the links that AccessPoint gives to people whose plug-in is working fine are different from the links it gives to people whose plug-in is not working. The links it gives to people whose plug-in is working end with "...&client=Plugin". Based on noticing this, we have come up with a workaround - somebody whose plug-in works properly emails the qvw link to people whose plug-in is not working, and they click on it, rather than entering through AcessPoint. Unless they have IE open when they click the link, this works perfectly. If they have IE open they get an error message.