Pidgin automaticall blocking contact

[Ubiquinone .]

During the midst of a conversation, I noticed that my yahoo contact was 
somehow blocked ( I connect through MSN) . I assumed I had done it by 
mistake, but ever since then every time I log back into pidgin this 
contact is automatically blocked. This is the only yahoo contact I have,
 I assume it would happen to others if I had them. 

Any advice? 		 	   		  
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