To IDL8.7.3 and macOS 10.15 Catalina users (I'm running Catalina 10.15.4 on a 2019 MB Pro)

I have an error with readfits() or mrdfits() when the image is on an external HD or an USB key.

% Compiled module: $MAIN$.
% MRDFITS: File access error
% MRDFITS: OPENR: Error opening file. Unit: 100, File: /Volumes/LaCie/data_spy/image.fits
% Illegal variable attribute: WAVE.
% Execution halted at: $MAIN$

From the terminal, I can cd to /Volumes/LaCie/data_spy/ and ls all my files...

I have no issue on another mac running High Sierra and the same IDL 8.7.3 version.

Do you have any idea on what's going on ? a turn-around ?

Thanks!