Non working shader in beta27

just try to switch a project from beta25 to beta27
but i’ve some errors with 2 great shaders

1/ tf’s droste effect
2/kalle echo fx (only happen with the echo8.fx version)
kalle.shader#echo4.fx echo6.fx echo8.fx

-droste: (enum list bug):
E 58 Compiled shader code uses too many arithmetic instruction slots (66). Max. allowed by the target (ps_2_0) is 64. bicubic.fxh D:\projects\patches\test\subPatches\Textures\droste
E 111 There was an error compiling expression Droste.fx D:\projects\patches\test\subPatches\Textures\droste
E 0 ID3DXEffectCompiler: Compilation failed Droste.fx D:\projects\patches\test\subPatches\Textures\droste

-echo8(enum list bug):
E 531 redefinition of ‘LerpEcho’ Echo8.fx D:\projects\contributions\effects\Echo

any ideas on how to fix that ??!
thanks in advance

just need to update PS to 3_0 for droste

and follow the naming convention explained here
to avoid errors!