Yes. I've experienced the exact issue you have - "the login screen appearing for a second and then going to a blank screen during a normal boot/reboot".
My system is very similar to yours by the way:
Intel Core 2 Quad, 8.0 GB DDR2, 500 GB HDD, 320 GB HDD, Nvidia GT 210 w/1.0 GB DDR3 (running Nvida 295 driver)
I found out a few things. Updating to the post release Nvidia drivers did not resolve the issue for me. Changing the login manager from MDM to LightDM did fix the issue but it displays an Ubuntu branded login screen. The issue did not happen for me if I installed all updates and kernel upgrades before installing the Nvidia drivers. However, after doing a second recommended kernel upgrade yesterday with the Nvidia drivers already installed, the 1 second MDM login issue reared its ugly head. I tried the GDM login manager and that works but the default "theme" is an ugly bright blue and I didn't research how to change it.
Also, the recommended Nvidia proprietary drivers work fine in Xbuntu 12.04 (which is a beautiful and very fast running release) and Lubuntu 12.04 even after 2 kernel upgrades. Both use the LightDM login manager to the best of my knowledge. My guess is that there is an issue with the MDM login manager and the Nvidia drivers that crops up after the kernel is updated. I have no idea if it's related to any specific kernels or not.
You can use the Nouveau drivers or change login managers to work around this issue, or try the post release driver which as I said didn't work for me. Or you can use a previous Mint version or another distro. I would stay away from any distro that uses MDM if you plan on installing the current Nvidia drivers and upgrading your kernel. I'm curious to find out what will happen in my LMDE 201204 xfce (uses MDM 1.0) when a kernel upgrade hits and I update Nvidia to the latest which I'm not inclined to do. If you find out any more pertinent info regarding this issue, please share
