latest build broke code

Tue Jul 2 18:27:34 UTC 2013

Hello,

I developed a paradigm on a lab computer running e-prime 2.0 (I believe it 
was the previous build). Everything worked great on that machine. Now that 
I've taken the paradigm to the computers we will be testing participants 
on, it does not work properly. These computers are running the latest 
version of e-prime (2.0.10.242).

It is a basic 3-back task (participants are shown a series of letters one 
at a time and must indicate whether the currently displayed item matches 
the letter displayed 3 times ago). Because the letters are selected 
randomly (as opposed to a predetermined sequence), different trial types 
are handled via different procedures and lists (e.g., first three items by 
default can't be targets, then the rest are either a target or not). Since 
the letters are being drawn randomly but there is a fixed ratio of how many 
targets to non-targets, inline code tells the program if it draws a target 
item for a non-target trial to replace that letter with another one. 
Similarly, if it is a target trial, inline code tells the program to 
display the target letter (via a variable ThreeLettersBack that is 
constantly updated). Since the list governing target trials does not know 
ahead of time what the target letter will be, the value for the list 
attribute "Letters" (necessary for the text box displaying the letters in 
the procedure) is left as '?'. On the older build of e-prime, the inline 
code was enough to override that value and the program would correctly 
display the actual target letter on target trials. On this newest build on 
the other computers, for some reason the inline code is not sufficient and 
the program displays '?' from the list instead of the letter value provided 
by the inline code. Looking at the output files reveals that the program is 
selecting a letter, for some reason it just won't display it. Non-target 
trials work just fine.

Any ideas what may have changed in this latest build to make this 
difference? Any recommendations for overcoming it? I will paste the inline 
code below so you have more information. Again, this is just for the target 
trials procedure. It references "ThreeList" which is the parent list 
governing both target and nontarget trials and comes after the 
list/procedure for the first three trials (nontarget by definition).

'Add contents of ThreeList to the "context" in which we are working.
c.Add ThreeList
c.Update

c.SetAttrib "Letters", ThreeLettersBack

'Set ThreeLettersBack to what was previously TwoLettersBack.
'Set TwoLettersBack to what was previously OneLetterBack.
'Set OneLetterBack to the current letter.
ThreeLettersBack = TwoLettersBack
TwoLettersBack = OneLetterBack
OneLetterBack = c.GetAttrib("Letters")

Thank you for your assistance. I know that is a lot, so I am happy to 
provide more information/clarification if that will be helpful.

Travis

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