I have been trying for months and it just spins saying "calculating relatives" then times out and tells me to use settings to update tree then spins out again "calculating relatives!"
When you say "relative finder" what are you looking at precisely? Are you trying to use BYU Relative Finder? If so, are you correctly logged into FamilySearch? Is the FamilySearch account you are using linked to your tree?
https://www.relativefinder.org/#/main is the site.
I had no problem - but it did not find any relatives.
Try clearing your cookies and try again. https://www.familysearch.org/cookies
I had the same problem. What worked for me was to delete the account.
Locate the word MORE in the top right-hand corner of the Relative Finder page, then choose SETTINGS. Once there, look for the red box DELETE ACCOUNT. If you click it the account will be deleted, then you can reregister. There was a caution that this action would delete your groups, so use with care. I did not have any groups. It is now working for me.