Fix Japanese IME after April 2018 update

Question

I have this problem on two computers now. I had the Japanese language pack installed, and used the IME keyboard. I used to be able to use CTRL-CAPSLOCK to switch to Hiragana after changing the language to Japanese. I could also right click the A icon in the system tray and pick Hiragana from the menu. This allowed me to type romaji which were changes to the appropriate hirgana/kanji. But after installing the April 2018 update 1803, both methods don't change from half-width alpha-numeric.

Solution

This seems to be related to the custom dictionary file (imjp15cu) as it gives an error whenever "edit" under custom dictionary is clicked in the advanced settings.

From a non-1803 system, copy the files in C:\Windows\IME\IMEJP\DICTS to the same location on the affect 1803 machine and reboot.

Comments

[Elijah Ely]

SUCCESS! it is definitely related to the dictionary files.

[Elijah Ely]

I copied the C:\Windows\IME\IMEJP\DICTS from a non 1803 machine and it resolved the issue entirely.

[Andy]

Might want to edit that into your answer then, otherwise your answer is just a comment :-)

[Ramhound]

November 2018 is in approximately 5 months. This answer is confusing. 1803 was released on April 30th so a file with a modified date of May 10th doesn’t make sense.

[Andy]

@ramhound I wouldn't assume the timestamps for individual files are necessarily accurate.

[Ramhound]

@Andy - Which is the reason this answer is confusing. The author could clarify their answer, although even with a clarification, it does not really answer the author's question.

[Andy]

@Ramhound If the answer is correctly saying what the timestamps of the files actually are, then I don't see how its confusing.

[Salomon Zhang]

I did in a different way. 'Open advanced settings', in 'Dictionary/Auto-tuning' tab, click Repair dictionaries button. I just worked afterwards.