From: nma@12000.org   
      
   I am updating CAS integration for Mathematica 11 and Rubi 4.9.2   
   (before it was Mathematica 10.4 and Rubi 4.9). (it has been compiling   
   for last 7 days, should be done in few more days).   
      
   I noticed that using Rubi 4.9.2 (downloaded August 10, 2016),   
   Rubi do not integrate Timofeev 319 any more. But it   
   did when using 4.9 downloaded March 14 2016 from Albert Rich web site.   
      
   4.9 (March 14 2016 downloaded)   
   ================================   
   ShowSteps = False;   
   Int[1/((3*x + 3*x^2 + x^3)*(3 + 3*x + 3*x^2 + x^3)^(1/3)), x]   
      
      
   -(((1 + x)*   
         Hypergeometric2F1[1/3, 1,   
          4/3, (3*(1 + x)^3)/(2 + (1 + x)^3)])/(2 + (1 + x)^3)^(1/3))   
      
   4.9.2 (August 10, 2016 downloaded)   
   ===================================   
   The above integral do not evaluate any more.  i.e Rubi fails   
   to integrate it, it gives (notice it has Int remaining inside)   
      
   ((1 + 2^(1/3) + x)^(1/3)*(2 - 2^(1/3)*(1 + I*Sqrt[3]) + 2*x)^(1/3)*   
   (2 + I*2^(1/3)*(I + Sqrt[3]) + 2*x)^(1/3)*   
        Int[1/(x*(3 + 3*2^(1/3) + 3*x)^(1/3)*(3 -   
   (3*(1 - I*Sqrt[3]))/2^(2/3) + 3*x)^(1/3)*(3 - (3*(1 + I*Sqrt[3]))/2^(2/3) +   
   3*x)^(1/3)), x])/   
       (2^(2/3)*(3 + 3*x + 3*x^2 + x^3)^(1/3)) -   
   ((1 - I*Sqrt[3])*(1 + 2^(1/3) + x)^(1/3)*(2 - 2^(1/3)*   
   (1 + I*Sqrt[3]) + 2*x)^(1/3)*   
        (2 + I*2^(1/3)*(I + Sqrt[3]) + 2*x)^(1/3)*Int[1/((3 - I*Sqrt[3] + 2*x)   
   *(3 + 3*2^(1/3) + 3*x)^(1/3)*(3 - (3*(1 - I*Sqrt[3]))/2^(2/3) + 3*x)^(1/3)*   
           (3 - (3*(1 + I*Sqrt[3]))/2^(2/3) + 3*x)^(1/3)), x])/(2^(2/3)*   
   (3 + 3*x + 3*x^2 + x^3)^(1/3)) -   
      ((1 + I*Sqrt[3])*(1 + 2^(1/3) + x)^(1/3)*(2 - 2^(1/3)*(1 + I*Sqrt[3]) +   
   2*x)^(1/3)   
   *(2 + I*2^(1/3)*(I + Sqrt[3]) + 2*x)^(1/3)*   
        Int[1/((3 + I*Sqrt[3] + 2*x)*(3 + 3*2^(1/3) + 3*x)^(1/3)*   
   (3 - (3*(1 - I*Sqrt[3]))/2^(2/3) + 3*x)^(1/3)*   
   (3 - (3*(1 + I*Sqrt[3]))/2^(2/3) + 3*x)^(1/3)),   
         x])/(2^(2/3)*(3 + 3*x + 3*x^2 + x^3)^(1/3))   
      
   I see the rules have changed. Is there a problem here?   
      
   So now Rubi fails 3 Timofeev integrals, while before it only failed   
   on two integrals.   
      
   ps. on Version numbers of Rubi, it will help if there is a command   
   to check Rubi version number as the Rubi notebook title says   
   4.9 for both, but I know they are not the same, one is 4.9 and one is   
   I assume 4.9.2.   
      
   I keep Rubi package in different folders, with time-stamp when I   
   downloaded it so I know. But it will be better to put   
   the current version number in the notebook title at least, so   
   it is clear  or provide a command to use to get the exact version.   
      
   thanks,   
   --Nasser   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)