>LyX 1.6.1 for Mac cannot correctly import tex files, even >if the tex file has been previously exported from a LyX 1.6.1 >file. When the tex file is imported, LyX does not recognize >the environments (theorems, lemmas, definitions, etc.), leaves >them as plain tex commands, and cannot compile the file (the >error dialogue saying "unknown environment"). Version 1.5.7 >has no problems of this sort.
Have a look at this thread on the users's list: http://thread.gmane.org/gmane.editors.lyx.general/53095 Vincent
