after last week updates to W7 (10.09.2015 Windows KB 3092627) Lightroom 5.7 starts but does not recognize the catalogs and it locks.
Computer charachteristics:
DELL Precision T5610
Intel Xeon CPU
ES-2609 V2@2.50 GHz
RAM 16 Gb
OS 64 bit
Video Card NVIDIA Quadra K2000
