Ubuntu – Samba Share user/password error after update

this is the first time that I couldn't find an answer so this is my first question. I will provide as much information as possible. I have an ASUS router that has 2 HDDs. There is only 1 username/password to access the media while on the network. My PC no longer seems to be able to access it after an update.

After initially entering the login credentials and selecting "Remember forever" I had always (over 2 years) been able to access the drives by going to "Browse Network" in nautilus and clicking on the Router's Icon then clicking the folder I want to access. Today I had a security update which contained the following:

Now when I go to access the folders on the HDDs this pops up:

I select "Registered User" enter the username, password and select "Remember forever" then click Connect and the box pops back up greyed out with the fields reset to defaults.

If I click the connect button again the same greyed out pop-up keeps coming back over and over.

If I manually close it. A brand new pop-up appears that allows me to enter in the credentials. However, if I enter them again nautilus simply closes and I occassionally get a pop-up saying that Ubuntu has encountered and internal error etc.

There are 3 Phones, 1 Tablet, 1 Win7 PC, and another Ubuntu 15.10 PC that can connect to the network drives and read/write without issue. I should add that I ignored the update mentioned above on the other Ubuntu PC once I started to have this issue on mine.

So far the only way I can access the HDDs with my PC is to turn off my router's security for samba access. I really have no idea how to remedy this or how to get it back to the way it was.

Thanks in advance for any help.