Hi Juli,
I would suggest checking the application pools on the server where DBXL and SharePoint are installed.
DBXL has its own application pool on the server. Please check which identity it is using.
Then check the SharePoint - 80 app pool (assuming that DBXL has been installed on the SharePoint - 80 site). Which identity is the SharePoint - 80 app pool using?
DBXL encounters issues if the DBXL and SharePoint-80 app pools are using different identities. The solution is to modify the DBXL app pool to use the same identity as the SharePoint-80 app pool.
Please let us know if you need additional information. Thank you.