diff --git a/package/src/Interpreter.jl b/package/src/Interpreter.jl
index ec6e7d3..f3c392d 100644
--- a/package/src/Interpreter.jl
+++ b/package/src/Interpreter.jl
@@ -25,7 +25,7 @@ function interpret(expressions::Vector{Expr}, variables::Matrix{Float32}, parame
 	cudaParams = Utils.create_cuda_array(parameters, NaN32) # column corresponds to data for one expression
 	cudaExprs = Utils.create_cuda_array(exprs, ExpressionElement(EMPTY, 0)) # column corresponds to data for one expression; TODO: replace this 0 with 'undef' if possible
 	# put into seperate cuArray, as this is static and would be inefficient to send seperatly to every kernel
-	cudaStepsize = CuArray([Utils.get_max_inner_length(parameters), size(variables, 1)]) # max num of values per expression; max nam of parameters per expression; number of variables per expression
+	cudaStepsize = CuArray([Utils.get_max_inner_length(exprs), Utils.get_max_inner_length(parameters), size(variables, 1)]) # max num of values per expression; max nam of parameters per expression; number of variables per expression
 
 	# each expression has nr. of variable sets (nr. of columns of the variables) results and there are n expressions
 	cudaResults = CuArray{Float32}(undef, variableCols, length(exprs))
@@ -47,21 +47,24 @@ end
 const MAX_STACK_SIZE = 25 # The depth of the stack to store the values and intermediate results
 function interpret_expression(expressions::CuDeviceArray{ExpressionElement}, variables::CuDeviceArray{Float32}, parameters::CuDeviceArray{Float32}, results::CuDeviceArray{Float32}, stepsize::CuDeviceArray{Int}, exprIndex::Int)
 	varSetIndex = (blockIdx().x - 1) * blockDim().x + threadIdx().x # ctaid.x * ntid.x + tid.x (1-based)
-	@inbounds variableCols = length(variables) / stepsize[2] # number of variable sets
+	@inbounds variableCols = length(variables) / stepsize[3] # number of variable sets
 
 	if varSetIndex > variableCols
 		return
 	end
 
-	@inbounds firstParamIndex = ((exprIndex - 1) * stepsize[1]) # Exclusive
+	@inbounds firstExprIndex = ((exprIndex - 1) * stepsize[1]) + 1 # Inclusive
+	@inbounds lastExprIndex = firstExprIndex + stepsize[1] - 1 # Inclusive
+	@inbounds firstParamIndex = ((exprIndex - 1) * stepsize[2]) # Exclusive
 	# TODO: Use @cuDynamicSharedMem/@cuStaticSharedMem for variables and or parameters
 
 	operationStack = MVector{MAX_STACK_SIZE, Float32}(undef) # Try to get this to function with variable size too, to allow better memory usage
 	operationStackTop = 0 # stores index of the last defined/valid value
 	
-	@inbounds firstVariableIndex = ((varSetIndex-1) * stepsize[2]) # Exclusive
+	@inbounds firstVariableIndex = ((varSetIndex-1) * stepsize[3]) # Exclusive
 	
-	@inbounds for expr in expressions
+	@inbounds for i in firstExprIndex:lastExprIndex
+		expr = expressions[i]
 		if expr.Type == EMPTY
 			break
 		elseif expr.Type == INDEX
diff --git a/package/test/ExpressionProcessingTests.jl b/package/test/ExpressionProcessingTests.jl
index a5545a2..4a976eb 100644
--- a/package/test/ExpressionProcessingTests.jl
+++ b/package/test/ExpressionProcessingTests.jl
@@ -26,7 +26,8 @@ end
 
 	append!(reference, [ExpressionProcessing.convert_to_ExpressionElement(1), ExpressionProcessing.convert_to_ExpressionElement(1.0), ExpressionProcessing.convert_to_ExpressionElement(2), ExpressionProcessing.convert_to_ExpressionElement(MULTIPLY), 
 	ExpressionProcessing.convert_to_ExpressionElement(ADD), ExpressionProcessing.convert_to_ExpressionElement(-1), ExpressionProcessing.convert_to_ExpressionElement(ADD)])
-	postfix = expr_to_postfix(expressions[1])
+	cache = Dict{Expr, PostfixType}()
+	postfix = expr_to_postfix(expressions[1], cache)
 
 	@test isequal(reference, postfix)
 
diff --git a/package/test/runtests.jl b/package/test/runtests.jl
index 468e456..46afba3 100644
--- a/package/test/runtests.jl
+++ b/package/test/runtests.jl
@@ -10,8 +10,8 @@ include(joinpath(baseFolder, "src", "Interpreter.jl"))
 include(joinpath(baseFolder, "src", "Transpiler.jl"))
 
 @testset "Functionality tests" begin
-	# include("ExpressionProcessingTests.jl")
-	# include("InterpreterTests.jl")
+	include("ExpressionProcessingTests.jl")
+	include("InterpreterTests.jl")
 	include("TranspilerTests.jl")
 end