Handling of missing links HAS changed, and in my opinion for the worse, but at the request of users, so that missing links no longer open the Links panel automatically or ask you to update on opening as they used to, though you should still receive a warning that the links are missing UNLESS YOU HAVE TURNED IT OFF IN YOUR PREFERENCES. It's on by default and you will find the option under the file handling section.
The rationale is that many workflows do not require that links be intact to accomplish the current editing, and longer documents with hundreds of missing links used to take many minutes to open while ID searched, essentially costing those users lots of money.
IF you have stored the links in the same directory as the .indd file, and IF you have moved the entire directory and IF you have enabled finding missing links when opening files, InDesign will find and update the locations for the links when the file is opened. If ID is unable to locate a link, because it is not in the current directory or a subfolder, you will see a warning message (in the past you would have had the option to browse for the missing files), and you must open the links panel if you wish to fix them manually.
In my opinion this is a very acceptable situation, and a great benefit to all types of workflows. I need to know links are modified or missing, so I've left that enabled. Those who don't need to know are no longer bothered or delayed. I suggest you pay a visit to the preferences and make sure that missing/modified checks are enabled, and if you are still having problems then your links aren't stored in the same directory, and that has always been an issue in ID when things get moved.