Bug display usage of object properties

[KaiSchnepf]

Unfortunately, I could not find any related issue. Protégé 5.5.0 for Windows 10: When I want to check where we use a certain object property, the following bug occurs:

I can click on the classes where both classes consist of only one word. Also, I can click on the classes where we use one class with one word and the other class with more than one word. But I cannot click on the classes where both classes consist of two or more words. The classes with two or more words are each implemented with: 'xxx' Examples:

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• 
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Thanks for your help in advance!