Hum... now this one looks promising so far. First thing to notice is 
that it's somewhat darker than the previous shots (thank God I chose 
OpenEXR output!), and has a noticeable brightness "imbalance" towards 
the left side; so far, the only hint of light "seeping" through is below 
the door, which is perfectly ok.

Oh boy, these settings really kill render time (1 day 6 hours already):

       pretrace_start 0.064
       pretrace_end   0.001
       count 1600
       nearest_count 20
       error_bound 0.3
       recursion_limit 4
       low_error_factor 0.5
       gray_threshold 0
       minimum_reuse 1.0e-4
       maximum_reuse 1.0e-3
       brightness 1.0
       always_sample off
       adc_bailout 0.001
       normal on

It also eats memory like hell, using as much as 4 GB by now (with only 
200 MB being due to geometry and texture images). I guess I should try 
reducing nearest_count, or I might wind up in Swapping Hell.

(As a side note, I'm using a patch that changes maximum_reuse handling, 
which hasn't been included in any beta yet.)

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