Version:           1.9.0 (using KDE 4.6.2) 
OS:                Linux

If tags are set to be automatically written to images, adding a tag before the tag writing process is complete causes digikam to hang immediately.  

Reproducible: Always

Steps to Reproduce:
1. enable "save image tags as "keywords" tags in metadata embedded in files"
2. add a tag to a large collection of images (say, 20+)
3. before process completes, add second tag - digikam hangs

Actual Results:  
digikam hangs, requiring kill and restart

Expected Results:  
second tag should be added gracefully without a hang