Problem with NeHe tutorials

The first tutorials just work fine (2-9), but starting from tutorial 10, I get some problems in this function:

Function LoadGlTextures()
	Local PointeurImg:Byte Ptr
	Local TexWidth
	Local TexHeight
	tex01:TPixmap=LoadPixmap("data\mud.bmp")
	TexWidth=tex01.Width
	TexHeight=tex01.Height
	PointeurImg=PixmapPixelPtr(tex01,0,0)
	pp=0
	For y=TexHeight-1 To 0 Step -1
		For x=0 To TexWidth-1
			Checkimage[y,x,0]=PointeurImg[pp]
			Checkimage[y,x,1]=PointeurImg[pp+1]
			Checkimage[y,x,2]=PointeurImg[pp+2]
			pp=pp+3
		Next
	Next
'	tex01 = Null
'	FlushMem
	Release tex01
	' Create Nearest Filtered Texture
	glGenTextures 3, Varptr Texname[0]
	glBindTexture GL_TEXTURE_2D,Texname[0]
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST
	glTexImage2D GL_TEXTURE_2D, 0, 3, TexWidth, TexHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, Checkimage
	' Create Linear Filtered Texture
	glBindTexture GL_TEXTURE_2D, Texname[1]
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR
	glTexImage2D GL_TEXTURE_2D, 0, 3, TexWidth, TexHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, Checkimage
	' Create MipMapped Texture
	glBindTexture GL_TEXTURE_2D, Texname[2]
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR
	glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST
	gluBuild2DMipmaps GL_TEXTURE_2D, 3, TexWidth, TexHeight, GL_RGB, GL_UNSIGNED_BYTE, Checkimage
End Function

The error is on the line "Release Tex01" and it states:
"Subexpression for release must be an integer variable".

When I comment out that line and use "Tex01 = Null" and "Flushmem" (the commented lines before "Release Tex01"), then the tutorial works.

When I downloaded these tuts (about a month ago), they all worked fine.
Has some upgrade of BMax changed the way Release works?

Yep, the use of Release has changed to be used with integer handles only.

Ok, no problem.
I just have to open every tutorial and make the adjustments to use ... = NULL and FlushMem.

Thanks.

Just comment out the release statements then BMX will auto flush the objects.