I have released a (very) small update to my Japanese Input application. The update consists of an update stroke data file. I discovered that the old file did not include the kanji 場 (Unicode U+5384), which is a fairly common kanji (and a jouyou kanji). The new file includes this kanji so you will be able to write it using Japanese Input.
The CAB and source files on the Japanese Input page now include the updated stroke data, so if you downloaded it after this post was made you should be fine. If you're not sure, simply try to write the kanji 場. If it recognizes it, you've got the new version (be sure not to confuse it with the kanji 揚, which the old (and new) version does recognize).
If you have the old version, you can either download the updated CAB file and reinstall (I recommend you soft-reset your device before doing this), or you can manually update the stroke data file, using the procedure described below.
If you are using Japanese Input and notice any other common kanji (especially if they are jouyou kanji) that are missing, please let me know.