The Remove Styles And Formatting From Text And Tables Removes formatting, such as typeface, type color, and type style, from the imported text, including text in tables. Paragraph styles and inline graphics aren’t imported if this option is selected. (Refer http://help.adobe.com/en_US/indesign/cs/using/WS714a382cdf7d304e7e07d0100196cbc5f-6199a.ht ml#WSa285fff53dea4f8617383751001ea8cb3f-6f41a )
To apply styles when importing text you can use the style mapping option shown in the image below:
Are you working in CS6 or CC ( The screenshoot has a darker UI which was introduced in Indesign CC )
Also is this the same problem with all the documents??
Have you tried to reset the prefrence of the application :FAQ: Trash, Replace, Reset, or Restore the application Preferences
Yes I work with CC version, and I have the problem with all documents.
But it happens to when I worked with CS6.
I will try to erase preferences, but I have install indesing in my home computer without previous version, and have the same problem.
I have clear cache and it seems to work