It could be corruption of the file. Try saving as IDML (File > Save as > InDesign CS4 or later [IDML]). Gets rid of corruption. Reopen in InDesign.
hi Steve -
If I save that as IDML and reopen, will I lose any features? Or is this a safe way to fix a corrupted file?
(I'll try it on a backup - but just curious; I assume if you go from a new version and save to an older one, you might lose any features that weren't present in the old program)
If not a corruption, it might be a text wrap issue. Select the text frame and in Text Frame Options, tick Ignore Text Wrap.
converting a graphic frame ( e.g. with arbitrary shape ) to a text frame for typing in can be done in two ways:
1. Select the graphic frame and convert it to a text frame by using the menu command:
Menu: Object > Content > Text
2. Click with Text tool inside the graphic frame.
But this will only work if the InDesign preferences are set accordingly.
Preferences > Type > [ x ] Type Tool Converts Frames to Text Frames
Hope, this helps.