ISA and sharepoint gridviews

Rather then bore you with all the details of hours spent to find this little gem.. I'll just say
"Link translation".
If you turn off link translation for the rule that publishes your sharepoint site in ISA, Gridviews (aka. dataviews of datagrid views) will work like you were hitting the IIS server and not looping through ISA. Now a little more about this scenario. The sharepoint site was up and running just fine and dandy with it's new ISA reverse proxy when came the calling.. the "gridviews are locking up". Turning off link translation either just for that firewall rule, or if you like.. turn off the "add-in" link translation filer all together (first way does one site, the second turns off the feature on the ISA server and all the sites it publishes).
I hope that saves one of you hours of work.