I recently upgraded to Plplot 5.11.0. If I use Plplot from within a Fortran 90 
code that tries to open a formatted file and read from it, I get an error upon 
execution:

forrtl: severe (257): formatted I/O to unit open for unformatted transfers, 
unit 15, file 
/Users/dsp/fortran_code_development/taeflseab/MVanZeeland_ECH_2015/modeling_inputs_157737_t470.txt
Image              PC                Routine            Line        Source      
       
libplplotf95.12.d  0000000109393DDC  Unknown               Unknown  Unknown
xmvz-read          0000000109323889  Unknown               Unknown  Unknown
xmvz-read          0000000109320A4B  Unknown               Unknown  Unknown
xmvz-read          000000010932051E  Unknown               Unknown  Unknown

If I change the unit number from 15 to something else I still get the error. If 
I comment out the Plplot calls and compile without Plplot, the error goes away. 
It’s acting as if Plplot has occupied all available I/O units and declared them 
to be unformatted. How do I fix this?

- Thanks, Don
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