I think the bottom line is that the OU in the States is a fine, quality hechsher, though they have certain kulos they rely on. In the articles linked above it is clear that a year and a half ago there were serious concerns that the OU Israel was not up to the policies of Israeli Mehadrin hechsherim, or of their own exacting US standards. After that scandal the OU enacted certain changes to improve the level of their EY operations.
The question remaining is have those measures succeeded in bringing OU Israel up to standard or not? I personally do not know. I would like to hear from Yechiel Spira who raised the initial concerns to do a recheck and see if they have been addressed.