ENCODE errors during formatted output

[jabberwocky]

using version 10.0.025, I'm facing "format syntax" errors flagged by ENCODE (libifcoremd.dll). It usually happens only in release mode. Sometime a reboot and a clean build clear it up. I'm talking very old pieces of code, such as
CHARACTER*9 STUFF
IH = (dfloat(LENGTH)+512*1024)/(1024*1024)
WRITE (STUFF,'(SP,I9)') IH
Question: anybody reporting such "format syntax" crashes in code that's been working over 20 years?
Any known fixes in later versions?

[jimdempseyatthecove]

What is the type and value of LENGTH?
What is the type of IH?

[Steven_L_Intel1]

Can you show a small but complete program that has the problem? I can't think of an issue in recent years (even going back to 10.0, which is a ways), with format parsing and internal write (which is a standard version of the old ENCODE extension.)

[jabberwocky]

integer*4 (implied)