[MiKTeX] Problems with presentation in prosper class and MiKTeX 2.8

[Sasha B. <sas...@ma...>]

Hi!

Yesterday I had a problem with DviPdfm in my MiKTeX 2.5 
installation  (I have WinXP, SP2).
Today I installed MiKTeX 2.8 and this problem is resolved.

But now I have a problem with converting my presentations, 
written in prosper class. 
Usually I create ps-file and then convert it to pdf-file
using Adobe Distiller (7.0). 
And in MiKTeX 2.5 it was OK, no problem.
In MiKTeX 2.8 problems have arisen:

1) Distiller informed me that 
==============================================================
%%[Error: The PostScript contains Transparency pdfmark, 
   job aborted.]%%
%%[ Transparency is not allowed in Acrobat 4.0 or earlier.]%%
%%[ Error: undefined; OffendingCommand: pdfmark; ErrorInfo: 
   SetTransparency pdfmark ]%%

Stack:
/SetTransparency
1.0
/CA
1.0
/ca
-dict-


%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
%%[ Warning: PostScript error. No PDF file produced. ] %%
==============================================================
Let me note here that previous version of MiKTeX had no this problem...


2) OK, I've changed to Acrobat 5.0 and the following information 
 appeared:
%%[Error: Arial not found. Font cannot be embedded]%% 
Let me note here that previous version of MiKTeX had no this problem...


3) OK, I've found the single old eps-file 
 which had this font inside and changed it Arial to ArialMT 
(this font I have in Windows Font directory).
Now distillation process produces pdf-file, 
but instead of letters I see only squares!!!

Can anybody explain me what is the reason 
for all these strange things?
Why MiKTeX 2.5 is able to create ps-file, 
which can be coverted by Distiller to readable pdf-file, 
and MiKTeX 2.8 --- not?