LR 4.4 freezing in Develop Module, under light load, performing various tasks from WB to Adj Brush, to Crop Tool to Spot Tool, Gradient etc... freeze and crash has occurred using almost every tool. Intermittent for the last week, now happening almost every 5-10 minutes. Only software change was Adobe Flash upgrade. Catalog Optimised, Cache purged, working on a group of 50 images made with D700... nothing taxing at all... anyone else seen this? Productive and useful suggestions welcome. Windows 7 Pro, 16GB Ram, 1T C drive, 1T D Drive, image files in 4 disc array (JBOD). Less than ideal processor.