I don't really know, but a few thoughts:

   - I'm very suspicious about the daylight savings time possibility. Would
   you be comfortable sharing your specific timezone?
   - It might be helpful to see the results of
   file-or-directory-modify-seconds
   
<http://docs.racket-lang.org/reference/Filesystem.html#(def._((quote._~23~25kernel)._file-or-directory-modify-seconds))>
   for the source and .zo files.
   - Have you checked what your OS thinks about these modification times
   compared to your system time? When you create other files, does it mark
   them with the correct creation time?
   - What happens if you try to compile a module outside of a
   package/collection, perhaps via raco make or the compiler/compiler
   <http://docs.racket-lang.org/raco/API_for_Raw_Compilation.html?q=compile-zo>
   library?
   - You could see if manually setting the source file's modification time
   to something, say, a day in the past could trick it into working.



-Philip

On Wed, Mar 28, 2018 at 4:30 PM, Greg Trzeciak <gtrzec...@gmail.com> wrote:

> I was too quick with the success update - although I was able to install
> some packages that were failing before, the problem is not resolved for
> other packages - I have just tested "syndicate" package - exactly the same
> error.
>
> In the offline conversation with Kieran Hardy we briefly discussed some
> edge-case possibility: I can't be certain it is the case but I don't recall
> having the problem before the Weekend and it was the Weekend with a Summer
> time switch in my time zone -> UTC+1 + 1 (Daylight Saving Time).
>
> From the time of the fresh install I only managed to install 2 packages
> that previously failed: pop-pl and pollen-count and test them + install
> syndicate that failed, no other Racket activity today.
>
> Any ideas?
>
> G.
>
>
> On Wednesday, March 28, 2018 at 1:03:29 PM UTC+2, Greg Trzeciak wrote:
>>
>> Quick update - doing a fresh install of Racket solved the problem on my
>> machine, an interesting case nevertheless.
>>
>> On Wednesday, March 28, 2018 at 1:07:14 AM UTC+2, Greg Trzeciak wrote:
>>>
>>> Forgot to mention - my setup is: Racket 6.12 on Windows 10... could be
>>> some recent Windows update?
>>>
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