Hello Kate,
We have tested using custom dictionaries with a large number of words (>10000) and verified that the RadSpell control uses all of them. Perhaps there is a problem with a certain word in your custom dictionary, which contains invalid characters and is stopping the processing of the dictionary. Try looking at the custom words and removing words with numbers, or words containing dash, quote, or other non-alphabetical characters. Another thing you can try is change the spell check provider to
EditDistanceProvider. This should remove the restrictions on non-alpha characters in the words.
Greetings,
Lini
the Telerik team
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