This plugin generates a blank screen in the WP Admin when I activate it on an nl_NL localized blog. The strange thing is that this happens only if the master (blog-wide) nl_NL file is present.
Thus, to reproduce:
1. set WPLANG to nl_NL in wp-config.php
2. observe how Contact Form 7 itself is nicely localized
3. copy the WordPress-wide nl_NL.mo (any recent version) into wp-content/languages/
4. WP Admin becomes blank screen
(5. rename nl_NL.mo to something else to get rid of blank screen)
Anyone seen this problem? Is it since 2.9.2?