Description of problem:

Nautilus no longer connects to CIFS/SMB shares on the local network. The shares are found, but attempting to open any of them produces an error pop-up saying "Unable to access location. Mounting the Windows share failed: The argument is invalid" (The second line of the message is always displayed in local language, even if starting nautilus from a terminal window with LANG=C, so my translation may not exactly match the english wording.)

Mounting the shares directly (as root) from a terminal with 
mount -t cifs -o username=XXX,password=YYY,uid=NNN //server/share /mnt
works ok.

Version-Release number of selected component (if applicable):
GNOME nautilus 41.5

How reproducible:
Always


Steps to Reproduce:
1. open nautilus
2. click "other locations" in left pane
3. click "server name - SMB/CIFS" in the right pane
4. double click one of the listed shares in the right pane

Actual results:
Error message pop-up appears (unable to access...)


Expected results:
Pop-up with user name and password dialogue and radio buttons to select "registered user"


Additional info:
I tried reinstalling gvfs-smb, but that did not resolve the issue.