I'm running into a weird issue with SharePoint Designer 2010. When editing my DVWP in design mode, I normally can click within the web part and then cycle through my datasource rows using the "Data Source Details" pane. In this case, though, I am only able to cycle through the first 30 items of the list. That in itself might not be bad, but apparently the DVWP itself only has access to the first 30 items as well. The default view of the list is set to show items in batches of 300. I've checked another DVWP that's almost identical and confirmed that I can cycle through all 172 items in that list.
Has anyone seen this kind of thing before?
UPDATE: Just to clarify, this isn't in the paging of the DVWP itself - the web part shows a single record at a time based on a filter that matches the current site URL to a column in the list. The 30-item limit is on the datasource rows in the Data Source Details pane. It's still causing an actual issue with the web part, however, since the DVWP only seems to have access to the first 30 items in the list. If the current site URL is a match for item #31 in the list, the DVWP will tell me it can't find a match, whereas items #1 thru #30 work correctly.