I use: Editor: GNU Emacs 27.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
Hyperbole: 7.0.3a
Sys Type: x86_64-pc-linux-gnu
OS Type: gnu/linux
Window Sys: x
News Reader: Gnus v5.13
Making completion list...
Not sure where that is coming from above.
<(Read)> executes (man-show "grep")
Where is man-show defined. I don't have it in Emacs 26. Using the same Emacs version as you but under MacOS.
Invoking man grep in the background
if: Variable binding depth exceeds max-specpdl-sizeUnable to load color "unspecified-bg"
Unable to load color "unspecified-fg"
car: Variable binding depth exceeds max-specpdl-size
next-line: End of buffer
Seems like you have loaded something outside of Hyperbole that has caused an infinite loop, maybe improperly overloading a standard man function.
Try starting with no initializations and then loading Hyperbole manually.
Bob