Hi LeonidS I just tried to reproduce the experience on my 2 sites and could observe that they work well and that the error is only limited to when the login block is enabled on the homepage.

Apparently the time I experienced error on SPLASH PAGE last week was due to TMD resetting my site mistakenly to an old server that was last updated 12 months ago. I didn't check back when corrected as my latest setting has SPLASH PAGE disabled.