After upgrading from R2012 to the current release I am more or less unable to use the "import data" interface to import ascii files into the workspace. Anything more complex than some kilobyte csv-files without headers won't work.
Scanning a 5MB tab-separated file with some header lines and a few NAN cells takes minutes and results in an empty matrix. Opening the same file in an editor, e.g. Pluma takes a second and the content looks OK. QtiPlot also imports the file quickly and the visualizing the data works fine.
Trying to use the import function on a large file (500MB) forces MATLAB to crash.
Importing the same files (large and extra large) into the R2012 release on the same machine worked fine. When I use textscan I can process the data normally, all further steps work fine.
Any ideas what could be wrong or how I can make the import function work again? It used to be convenient, as I have quite a variety of single, different-formatted files.