readShapeSpatial error with 2.11.1

Anyone encounter an issue with using the readShapeSpatial function 
 from maptools in the latest version of R. ?I get a simple "Error in
 read.dbf(filen) : unable to open DBF file" but when i run the exact 
 script in 2.10.0 the script produces the map just fine. ?What has changed
or am i missing something/  

Sorry for no  code but i figured this may have been an unnecessary anyway.

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