I am an analyst with Korean data. I used the Korean version of Windows 7 and OS.
I have a problem with instrin VBA (Excel). In the normal case, it
instrgenerates the exact number in "C2" indicating the number of the starting point in the string "A2"
Here is a normal sample:

Even Koreans and Japanese (hiragana) also have no problems. I'm sorry, I can’t try anymore because I do not have enough reputation on this site.
But there is always a mistake when I use Japanese katakana. The error message is below the suggestion.
'7' runtime error occurred, insufficient memory
Refer to this sample:

,
, .
, - .